（笔记）LeetCode231 Power of Two题解

 
    public static boolean isPowerOfTwo(int n) {
        if (n <= 0) {
            return false;
        }
        if (n == 1) {
            return true;
        }
        while (n >= 2 && n % 2 == 0) {
            n /= 2;
        }
        return n == 1;
    }

    public static boolean isPowerOfTwo(int n) {
        return n != 0 && (n & (n - 1)) == 0;
    }